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GLOPNET The Global Plant Trait Network – a group of scientists who contributed trait data across the plant tree of life that was used to establish the leaf economic spectrum. The GLOPNET database was a precursor to the TRY database.
Gradient A continuous change in a property (such as temperature, rainfall, elevation) in space or time.
Grain size The dimensions of a sample unit. In remote sensing, analogous to
pixel size.
Graminoid A herbaceous plant with a grass-like morphology, such as a grass
or sedge.
Ground control point A coordinate that is measured on the ground or that can be
easily identified from preexisting imagery, such as road intersections, building
corners, and trees, and used to apply geometric correction to aircraft or satellite
image data.
Habitat The ecological or environmental area or conditions in which a particular
species or population lives, comprised of the biological and physical properties
and including the suite of resources, on which it depends.
Habitat heterogeneity The variability of habitat structure or composition in
space and time.
Hardwood The wood of dicotyledonous angiosperm trees.
Hemeroby refers to the degree of human influence on the environment in contrast
to the degree of naturalness of the environment in the absence of human influence. It can be measured in terms of the magnitude of the deviation from the
potential natural vegetation caused by human activities.
Heterogeneity Variability in space and/or time.
Hill numbers A unified standardization method for quantifying and comparing
species diversity across samples, originally presented by Mark Hill. These are
generalizable to all of the dimensions of diversity and consider the number of
species and their relative abundances within a local community.
Hydraulic traits Traits in plants related to water transport through vascular tissues (e.g., xylem), such as leaf water potential.
Hydrosphere A collective term for all water below, on, and above the Earth’s
surface.
Hyperspectral data Measurements in a large number of concurrent, narrow spectral bands (>20 to hundreds) across a wavelength region in a single spectrum or
within a pixel in a spectroscopic image (image cube).
Hyperspectral imaging See imaging spectroscopy.
Hyperspectral remote sensing Collection and processing of a wide range of
data in contiguous wavelengths with fine spectral resolution. Commonly used
as a synonym for imaging spectroscopy but can also include non- imaging
measurements.
Hyperspectral sensor or spectrometer An instrument for measuring many spectral bands. It is often used interchangeably with imaging spectrometer but can
also indicate a non-imaging spectrometer.
Hyperspatial data Spectral data or imagery having very small pixel sizes, generally less than 1 m ground sampling resolution. There are several satellites with
Glossary
GLOPNET The Global Plant Trait Network – a group of scientists who contributed trait data across the plant tree of life that was used to establish the leaf economic spectrum. The GLOPNET database was a precursor to the TRY database.
Gradient A continuous change in a property (such as temperature, rainfall, elevation) in space or time.
Grain size The dimensions of a sample unit. In remote sensing, analogous to
pixel size.
Graminoid A herbaceous plant with a grass-like morphology, such as a grass
or sedge.
Ground control point A coordinate that is measured on the ground or that can be
easily identified from preexisting imagery, such as road intersections, building
corners, and trees, and used to apply geometric correction to aircraft or satellite
image data.
Habitat The ecological or environmental area or conditions in which a particular
species or population lives, comprised of the biological and physical properties
and including the suite of resources, on which it depends.
Habitat heterogeneity The variability of habitat structure or composition in
space and time.
Hardwood The wood of dicotyledonous angiosperm trees.
Hemeroby refers to the degree of human influence on the environment in contrast
to the degree of naturalness of the environment in the absence of human influence. It can be measured in terms of the magnitude of the deviation from the
potential natural vegetation caused by human activities.
Heterogeneity Variability in space and/or time.
Hill numbers A unified standardization method for quantifying and comparing
species diversity across samples, originally presented by Mark Hill. These are
generalizable to all of the dimensions of diversity and consider the number of
species and their relative abundances within a local community.
Hydraulic traits Traits in plants related to water transport through vascular tissues (e.g., xylem), such as leaf water potential.
Hydrosphere A collective term for all water below, on, and above the Earth’s
surface.
Hyperspectral data Measurements in a large number of concurrent, narrow spectral bands (>20 to hundreds) across a wavelength region in a single spectrum or
within a pixel in a spectroscopic image (image cube).
Hyperspectral imaging See imaging spectroscopy.
Hyperspectral remote sensing Collection and processing of a wide range of
data in contiguous wavelengths with fine spectral resolution. Commonly used
as a synonym for imaging spectroscopy but can also include non- imaging
measurements.
Hyperspectral sensor or spectrometer An instrument for measuring many spectral bands. It is often used interchangeably with imaging spectrometer but can
also indicate a non-imaging spectrometer.
Hyperspatial data Spectral data or imagery having very small pixel sizes, generally less than 1 m ground sampling resolution. There are several satellites with
Glossary